Since location accuracy for low-altitude targets is not good in the Short-Baseline system, a program of the main station off-center of eight-station arrangement is proposed. Firstly factors are analyzed which influence the location accuracy for line-of-sight environments. Then the relationship between main station position and location performance is researched, and a location method for the main station off-center of eightstations is put forward by increasing the base-station number and layout of the main station off-center, which realizes multiple coverage of the monitoring area using the redundant measurement information by the main station off-center and more base stations provided. Finally the number of base stations and optimal disposition way for low-altitude targets are obtained in the airport by simulating the geometric dilution of precision (GDOP)distribution. Simulation figures and data show that the main station off-center of eight-station arrangement can be achieved over 95％ coverage of the airport for low-altitude targets location.%针对短基线低空目标不能很好定位的缺点,提出了一种主站偏心的8站布局定位方案.分析了在低空环境下影响定位精确度的因素,研究了主站位置分布与定位性能间的关系,提出了增加基站数目及主站偏置布局的主站偏心定位方法,利用偏置主站和多基站提供的冗余测量信息,实现了对监测区域的多重覆盖.通过分析几何精度因子分布图,得出在低空目标情况下适合机场区域内多点定位系统的基站数目和最优布站方式.仿真图形和数据表明,用主站偏心的八站对低空目标进行定位可以实现对95%以上机场区域的覆盖.
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